Six Sigma and Beyond: Statistics and Probability, Volume III
SAMPLE VARIANCE UNBIASED ’ E(s 2 ) = ƒ 2 )
| Note | the latter form is preferred for computations since computations can be done "on-the-run" as data is acquired . |
STANDARD DEVIATION (UNBIASED)
Recall
(a 2 ± b 2 ) 1/2 ‰ a ± b